Mechanical stoker.



W. M. DUNCAN.

MECHANICAL STOKBR.

APPLICATION FILED APB..4, 1910.

Patentd July 5,1910.

inventor:

WILLIAM 10:. Duncan, or nmomjmnrnors.

momma. sroxnn.

Specification of Letters Iatent. Application and A ril 4, 1910, Serial No. 553,227.

Patented July 5, 1910.

olperable u on and through the medium of s a fts usua l supplied with sprocket wheels around whic the chain operates, and when such s'tokers are made of-any eat width, there is .a constant tendency 0 the shafts mentioned becomin bent or sprung, due to the rea-t degree 0 strain im sed thereon by t e weight of the grate itself and the fuel it serves to support. Said shafts have commonly been supported only inend bearings and, as a consequence, the central portions of the shafts are partlcularly subjected to strain without any means for resisting the action of the strain upon the shafts.

My invention has for its object to "provide a reinforcing member or brace member, whereby an adequate degree of resistance against bending or sprin ng up of the central ortionsof the shaft is whic of the stoker shafts.

Figure I is aside elevation of a portion of a mechan cal stoker partly broken out, and in which my invention is incorporated. Fig. II isa. perspectiveview of my shaft ho ding device, with the shaft and sprocket wheels thereon; shown in dotted'lines. Fig. 111 is a vertical section taken on the line that serve to support the Hr-m, Fig, 1.

In the accompanyingdrawings:-1 designates one of the side walls,"or sup orting frames, of a mechanical. stoker, w ich is provided near one end with a guideway 2 in whicha shaft 3 provided with sprocket I wheels 'is movable. .The shaft 3 and its sprocketwheels serve as supportsat one end of the stoker'for the endless grate 5 that is sup orted at the opposite: end. of the stoker y a shaft 6 and sprocket wheels 7.

The parts thus far specifically described produced,- and 1s assoclated with the side membersv are'usual in mechanical stokers and no invention per se' is herein claimed for them.

8 deslgnates bearing blocks mounted in the idewa s 2 of the side frames 1 and provided wit bearing apertures 9 in which the ends of the sprocket wheel shaft 3 are journaled. These bearing blocks are equipped. with eye members 10 that receive draw rods 11 which extend through eyes 12 supported by the side frames 1 and are supplied with nuts 13.- These parts are designed to serve as supports for the shaft 3 and further as means whereby said shaft may be adjusted longitudinally of the stoker for the purpose of tightening the endless ate 5 and holding it in a tautcondition, 1n order that it may properly support the fuel that is placed thereon in the use of the grate.

- 14 designates a sta bar arranged parallel with the shaft 3 an secured at its ends to the bearing blocks 8 in such manner as to provide for such bearing blocks and cross bar serving as a ri 'd carrier or supporting frame for said s aft. The cross bar 14, is preferably, in order that it may have a hlgh egree of resisting power therein, made of I-beam structure.

15 is a bearin arm rigidly secured to the cross bar 14, an provided with a box 16 lo which theshaft 3 1s seated. A

It will be seen that the structure just de-- scribed provides for the endless grate suping box arm 15 and that, therefore, all liab1 it y of bending or springing of said shaft byreason of strain thereon is prevented.

It is obvious that while I have only shown one of thebearing box arms 15 applied to the cross bar 14 to serve in connection with the cross bar as a support and resisting means to-prevent injury to the shaft 3 under strain imposed thereupon b the endless ate 5, a greater number 0 such bearing fil ix arms may be utilized upon the cross bar, dependin upon necessity for the1r use, by reasono the len h 'of the shaft necessa for the support 0 the endless grate'accor in to its wldth'.

ile I have shown and described my im- I stoker, it is obvious that it may be applied central portion of the shaft mounted in these bearin blocks from lateral movement intermed iate of its ends, but also serves to hold the bearing blocks parallel with each other and reinforce them in such manner as to ro-o vide for their bein retained in proper ahnement with the si e frames and the guideways in which they are operable.

I claim:

1. In a mechanical stoker, the combination of side frames, movable carriers in said side frames, a traveling grate, a grate-supporting shafthaving its ends supported in said carriers, a resistance bar connected to said shaft intermediate of its ends, and at its ends to said carriers, and means for shifting said carriers, shaft and resistance bar jointly. 2. In a mechanical stoker, the combination of side frames, a traveling grate operable between said side frames, bearing blocks movably mounted vin said side frames, a

,upon by said grate supporting) shaft journaled at its ends in saidbearm locks, a resistance bar carried by said earing blocks and en aging said shaft intermediate of its ends, w ereby the central portion of said shaft is prevented from bendmg under strain imposed'thereate, and means for shifting said bearing b ocks, shaft and resistance bar jointly.

3. In a mechanical stoker, the combination of side frames, a traveling grate operable between said side frames, bearing blocks slidably mounted in said side frames,-a rate suplporting shaft 'ournaled at its en s in sai bear ngs bloc s, a resistance bar arranged parallel with said shaft and connected at its ends to said bearing blocks, an arm fitted to said resistance bar intermediate of its ends and having a box embracing said shaft intermediate of its ends, whereby the V T shaft is restrained from bending, and means for shifting said bearing blocks, shaft and resistance bar jointly.

' WILLIAM M. DUNCAN.

In the presence of- A. B. STRATToN, W. L. J UTTEMEYER. 

